Master iptables with GUI firewall builders
I believe that any network or system administrator who wishes to maintain an iptables firewall should learn iptables well, and be able to easily whip up a basic firewall from scratch. But learning how to do this is the tricky part, so this is where firewall builder programs earn their beans. With a firewall building utility you can get a functioning firewall up and running, and have scripts and rulesets to study. There are gazillions of the things, so today we'll look at three that I think are pretty good: Lokkit, KMyFirewall, and Firewall Builder.
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